SAN MATEO — In less than 12 hours, two people are dead after being struck and killed by cars Saturday.

The California Highway Patrol is currently investigating a fatal pedestrian collision on the South Airport Boulevard offramp in San Mateo.

The incident has blocked all lanes northbound on Highway 101, according to the CHP, which is warning drivers to expect delays and a severe traffic alert has been issued for travelers heading northbound.

There is no estimated time of opening the roadway.

Less than nine hours before, another vehicle struck and killed a man while he was waiting for a bus.

At 11:30 a.m., San Mateo police responded to the 1700 block of South Delaware Street where a man had reportedly been struck by a vehicle.

Police found San Mateo resident Reynaldo Aguiniga suffering from major injuries after he had been slammed with a cement garbage can that had been knocked into the air near a bus stop after a car ran into it, according to Sgt. Kurt Rodenspiel of the San Mateo Police Department.

Aguiniga was transported to a local hospital, where he succumbed to his injuries.

Although the driver of the vehicle briefly got out of his car to see the damage he caused, Rodenspiel said, he quickly got back in and drove off.

Others who were waiting at the bus stop with Aguiniga were able to provide enough of a partial plate description, which police used to track down the driver, Rodenspiel added.

Police tracked the car to a residence in San Mateo, where driver Josue Lopez was arrested on suspicion of felony hit and run as well as vehicular manslaughter.

WASHINGTON – Hillary Clinton challenged Congress on Thursday to combat fake and misleading news on social media, using a post-election appearance to tackle an issue that gripped her presidential campaign and culminated with a shooting incident Sunday in Northwest Washington.